git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/dispatcher/dsobject.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dsobject - Dispatcher object management routines
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2007, R. Byron Moore
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include <acpi/acparser.h>
  46 #include <acpi/amlcode.h>
  47 #include <acpi/acdispat.h>
  48 #include <acpi/acnamesp.h>
  49 #include <acpi/acinterp.h>
  50
  51 #define _COMPONENT          ACPI_DISPATCHER
  52 ACPI_MODULE_NAME("dsobject")
  53
  54 /* Local prototypes */
  55 static acpi_status
  56 acpi_ds_build_internal_object(struct acpi_walk_state *walk_state,
  57                               union acpi_parse_object *op,
  58                               union acpi_operand_object **obj_desc_ptr);
  59
  60 #ifndef ACPI_NO_METHOD_EXECUTION
  61 /*******************************************************************************
  62  *
  63  * FUNCTION:    acpi_ds_build_internal_object
  64  *
  65  * PARAMETERS:  walk_state      - Current walk state
  66  *              Op              - Parser object to be translated
  67  *              obj_desc_ptr    - Where the ACPI internal object is returned
  68  *
  69  * RETURN:      Status
  70  *
  71  * DESCRIPTION: Translate a parser Op object to the equivalent namespace object
  72  *              Simple objects are any objects other than a package object!
  73  *
  74  ******************************************************************************/
  75
  76 static acpi_status
  77 acpi_ds_build_internal_object(struct acpi_walk_state *walk_state,
  78                               union acpi_parse_object *op,
  79                               union acpi_operand_object **obj_desc_ptr)
  80 {
  81         union acpi_operand_object *obj_desc;
  82         acpi_status status;
  83
  84         ACPI_FUNCTION_TRACE(ds_build_internal_object);
  85
  86         *obj_desc_ptr = NULL;
  87         if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
  88                 /*
  89                  * This is a named object reference. If this name was
  90                  * previously looked up in the namespace, it was stored in this op.
  91                  * Otherwise, go ahead and look it up now
  92                  */
  93                 if (!op->common.node) {
  94                         status = acpi_ns_lookup(walk_state->scope_info,
  95                                                 op->common.value.string,
  96                                                 ACPI_TYPE_ANY,
  97                                                 ACPI_IMODE_EXECUTE,
  98                                                 ACPI_NS_SEARCH_PARENT |
  99                                                 ACPI_NS_DONT_OPEN_SCOPE, NULL,
 100                                                 ACPI_CAST_INDIRECT_PTR(struct
 101                                                                        acpi_namespace_node,
 102                                                                        &(op->
 103                                                                          common.
 104                                                                          node)));
 105                         if (ACPI_FAILURE(status)) {
 106
 107                                 /* Check if we are resolving a named reference within a package */
 108
 109                                 if ((status == AE_NOT_FOUND)
 110                                     && (acpi_gbl_enable_interpreter_slack)
 111                                     &&
 112                                     ((op->common.parent->common.aml_opcode ==
 113                                       AML_PACKAGE_OP)
 114                                      || (op->common.parent->common.aml_opcode ==
 115                                          AML_VAR_PACKAGE_OP))) {
 116                                         /*
 117                                          * We didn't find the target and we are populating elements
 118                                          * of a package - ignore if slack enabled. Some ASL code
 119                                          * contains dangling invalid references in packages and
 120                                          * expects that no exception will be issued. Leave the
 121                                          * element as a null element. It cannot be used, but it
 122                                          * can be overwritten by subsequent ASL code - this is
 123                                          * typically the case.
 124                                          */
 125                                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 126                                                           "Ignoring unresolved reference in package [%4.4s]\n",
 127                                                           walk_state->
 128                                                           scope_info->scope.
 129                                                           node->name.ascii));
 130
 131                                         return_ACPI_STATUS(AE_OK);
 132                                 } else {
 133                                         ACPI_ERROR_NAMESPACE(op->common.value.
 134                                                              string, status);
 135                                 }
 136
 137                                 return_ACPI_STATUS(status);
 138                         }
 139                 }
 140
 141                 /* Special object resolution for elements of a package */
 142
 143                 if ((op->common.parent->common.aml_opcode == AML_PACKAGE_OP) ||
 144                     (op->common.parent->common.aml_opcode ==
 145                      AML_VAR_PACKAGE_OP)) {
 146                         /*
 147                          * Attempt to resolve the node to a value before we insert it into
 148                          * the package. If this is a reference to a common data type,
 149                          * resolve it immediately. According to the ACPI spec, package
 150                          * elements can only be "data objects" or method references.
 151                          * Attempt to resolve to an Integer, Buffer, String or Package.
 152                          * If cannot, return the named reference (for things like Devices,
 153                          * Methods, etc.) Buffer Fields and Fields will resolve to simple
 154                          * objects (int/buf/str/pkg).
 155                          *
 156                          * NOTE: References to things like Devices, Methods, Mutexes, etc.
 157                          * will remain as named references. This behavior is not described
 158                          * in the ACPI spec, but it appears to be an oversight.
 159                          */
 160                         obj_desc = (union acpi_operand_object *)op->common.node;
 161
 162                         status =
 163                             acpi_ex_resolve_node_to_value(ACPI_CAST_INDIRECT_PTR
 164                                                           (struct
 165                                                            acpi_namespace_node,
 166                                                            &obj_desc),
 167                                                           walk_state);
 168                         if (ACPI_FAILURE(status)) {
 169                                 return_ACPI_STATUS(status);
 170                         }
 171
 172                         switch (op->common.node->type) {
 173                                 /*
 174                                  * For these types, we need the actual node, not the subobject.
 175                                  * However, the subobject got an extra reference count above.
 176                                  */
 177                         case ACPI_TYPE_MUTEX:
 178                         case ACPI_TYPE_METHOD:
 179                         case ACPI_TYPE_POWER:
 180                         case ACPI_TYPE_PROCESSOR:
 181                         case ACPI_TYPE_EVENT:
 182                         case ACPI_TYPE_REGION:
 183                         case ACPI_TYPE_DEVICE:
 184                         case ACPI_TYPE_THERMAL:
 185
 186                                 obj_desc =
 187                                     (union acpi_operand_object *)op->common.
 188                                     node;
 189                                 break;
 190
 191                         default:
 192                                 break;
 193                         }
 194
 195                         /*
 196                          * If above resolved to an operand object, we are done. Otherwise,
 197                          * we have a NS node, we must create the package entry as a named
 198                          * reference.
 199                          */
 200                         if (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) !=
 201                             ACPI_DESC_TYPE_NAMED) {
 202                                 goto exit;
 203                         }
 204                 }
 205         }
 206
 207         /* Create and init a new internal ACPI object */
 208
 209         obj_desc = acpi_ut_create_internal_object((acpi_ps_get_opcode_info
 210                                                    (op->common.aml_opcode))->
 211                                                   object_type);
 212         if (!obj_desc) {
 213                 return_ACPI_STATUS(AE_NO_MEMORY);
 214         }
 215
 216         status =
 217             acpi_ds_init_object_from_op(walk_state, op, op->common.aml_opcode,
 218                                         &obj_desc);
 219         if (ACPI_FAILURE(status)) {
 220                 acpi_ut_remove_reference(obj_desc);
 221                 return_ACPI_STATUS(status);
 222         }
 223
 224       exit:
 225         *obj_desc_ptr = obj_desc;
 226         return_ACPI_STATUS(AE_OK);
 227 }
 228
 229 /*******************************************************************************
 230  *
 231  * FUNCTION:    acpi_ds_build_internal_buffer_obj
 232  *
 233  * PARAMETERS:  walk_state      - Current walk state
 234  *              Op              - Parser object to be translated
 235  *              buffer_length   - Length of the buffer
 236  *              obj_desc_ptr    - Where the ACPI internal object is returned
 237  *
 238  * RETURN:      Status
 239  *
 240  * DESCRIPTION: Translate a parser Op package object to the equivalent
 241  *              namespace object
 242  *
 243  ******************************************************************************/
 244
 245 acpi_status
 246 acpi_ds_build_internal_buffer_obj(struct acpi_walk_state *walk_state,
 247                                   union acpi_parse_object *op,
 248                                   u32 buffer_length,
 249                                   union acpi_operand_object **obj_desc_ptr)
 250 {
 251         union acpi_parse_object *arg;
 252         union acpi_operand_object *obj_desc;
 253         union acpi_parse_object *byte_list;
 254         u32 byte_list_length = 0;
 255
 256         ACPI_FUNCTION_TRACE(ds_build_internal_buffer_obj);
 257
 258         /*
 259          * If we are evaluating a Named buffer object "Name (xxxx, Buffer)".
 260          * The buffer object already exists (from the NS node), otherwise it must
 261          * be created.
 262          */
 263         obj_desc = *obj_desc_ptr;
 264         if (!obj_desc) {
 265
 266                 /* Create a new buffer object */
 267
 268                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
 269                 *obj_desc_ptr = obj_desc;
 270                 if (!obj_desc) {
 271                         return_ACPI_STATUS(AE_NO_MEMORY);
 272                 }
 273         }
 274
 275         /*
 276          * Second arg is the buffer data (optional) byte_list can be either
 277          * individual bytes or a string initializer.  In either case, a
 278          * byte_list appears in the AML.
 279          */
 280         arg = op->common.value.arg;     /* skip first arg */
 281
 282         byte_list = arg->named.next;
 283         if (byte_list) {
 284                 if (byte_list->common.aml_opcode != AML_INT_BYTELIST_OP) {
 285                         ACPI_ERROR((AE_INFO,
 286                                     "Expecting bytelist, got AML opcode %X in op %p",
 287                                     byte_list->common.aml_opcode, byte_list));
 288
 289                         acpi_ut_remove_reference(obj_desc);
 290                         return (AE_TYPE);
 291                 }
 292
 293                 byte_list_length = (u32) byte_list->common.value.integer;
 294         }
 295
 296         /*
 297          * The buffer length (number of bytes) will be the larger of:
 298          * 1) The specified buffer length and
 299          * 2) The length of the initializer byte list
 300          */
 301         obj_desc->buffer.length = buffer_length;
 302         if (byte_list_length > buffer_length) {
 303                 obj_desc->buffer.length = byte_list_length;
 304         }
 305
 306         /* Allocate the buffer */
 307
 308         if (obj_desc->buffer.length == 0) {
 309                 obj_desc->buffer.pointer = NULL;
 310                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 311                                   "Buffer defined with zero length in AML, creating\n"));
 312         } else {
 313                 obj_desc->buffer.pointer =
 314                     ACPI_ALLOCATE_ZEROED(obj_desc->buffer.length);
 315                 if (!obj_desc->buffer.pointer) {
 316                         acpi_ut_delete_object_desc(obj_desc);
 317                         return_ACPI_STATUS(AE_NO_MEMORY);
 318                 }
 319
 320                 /* Initialize buffer from the byte_list (if present) */
 321
 322                 if (byte_list) {
 323                         ACPI_MEMCPY(obj_desc->buffer.pointer,
 324                                     byte_list->named.data, byte_list_length);
 325                 }
 326         }
 327
 328         obj_desc->buffer.flags |= AOPOBJ_DATA_VALID;
 329         op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc);
 330         return_ACPI_STATUS(AE_OK);
 331 }
 332
 333 /*******************************************************************************
 334  *
 335  * FUNCTION:    acpi_ds_build_internal_package_obj
 336  *
 337  * PARAMETERS:  walk_state      - Current walk state
 338  *              Op              - Parser object to be translated
 339  *              element_count   - Number of elements in the package - this is
 340  *                                the num_elements argument to Package()
 341  *              obj_desc_ptr    - Where the ACPI internal object is returned
 342  *
 343  * RETURN:      Status
 344  *
 345  * DESCRIPTION: Translate a parser Op package object to the equivalent
 346  *              namespace object
 347  *
 348  * NOTE: The number of elements in the package will be always be the num_elements
 349  * count, regardless of the number of elements in the package list. If
 350  * num_elements is smaller, only that many package list elements are used.
 351  * if num_elements is larger, the Package object is padded out with
 352  * objects of type Uninitialized (as per ACPI spec.)
 353  *
 354  * Even though the ASL compilers do not allow num_elements to be smaller
 355  * than the Package list length (for the fixed length package opcode), some
 356  * BIOS code modifies the AML on the fly to adjust the num_elements, and
 357  * this code compensates for that. This also provides compatibility with
 358  * other AML interpreters.
 359  *
 360  ******************************************************************************/
 361
 362 acpi_status
 363 acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state,
 364                                    union acpi_parse_object *op,
 365                                    u32 element_count,
 366                                    union acpi_operand_object **obj_desc_ptr)
 367 {
 368         union acpi_parse_object *arg;
 369         union acpi_parse_object *parent;
 370         union acpi_operand_object *obj_desc = NULL;
 371         acpi_status status = AE_OK;
 372         acpi_native_uint i;
 373         u16 index;
 374         u16 reference_count;
 375
 376         ACPI_FUNCTION_TRACE(ds_build_internal_package_obj);
 377
 378         /* Find the parent of a possibly nested package */
 379
 380         parent = op->common.parent;
 381         while ((parent->common.aml_opcode == AML_PACKAGE_OP) ||
 382                (parent->common.aml_opcode == AML_VAR_PACKAGE_OP)) {
 383                 parent = parent->common.parent;
 384         }
 385
 386         /*
 387          * If we are evaluating a Named package object "Name (xxxx, Package)",
 388          * the package object already exists, otherwise it must be created.
 389          */
 390         obj_desc = *obj_desc_ptr;
 391         if (!obj_desc) {
 392                 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
 393                 *obj_desc_ptr = obj_desc;
 394                 if (!obj_desc) {
 395                         return_ACPI_STATUS(AE_NO_MEMORY);
 396                 }
 397
 398                 obj_desc->package.node = parent->common.node;
 399         }
 400
 401         /*
 402          * Allocate the element array (array of pointers to the individual
 403          * objects) based on the num_elements parameter. Add an extra pointer slot
 404          * so that the list is always null terminated.
 405          */
 406         obj_desc->package.elements = ACPI_ALLOCATE_ZEROED(((acpi_size)
 407                                                            element_count +
 408                                                            1) * sizeof(void *));
 409
 410         if (!obj_desc->package.elements) {
 411                 acpi_ut_delete_object_desc(obj_desc);
 412                 return_ACPI_STATUS(AE_NO_MEMORY);
 413         }
 414
 415         obj_desc->package.count = element_count;
 416
 417         /*
 418          * Initialize the elements of the package, up to the num_elements count.
 419          * Package is automatically padded with uninitialized (NULL) elements
 420          * if num_elements is greater than the package list length. Likewise,
 421          * Package is truncated if num_elements is less than the list length.
 422          */
 423         arg = op->common.value.arg;
 424         arg = arg->common.next;
 425         for (i = 0; arg && (i < element_count); i++) {
 426                 if (arg->common.aml_opcode == AML_INT_RETURN_VALUE_OP) {
 427                         if (arg->common.node->type == ACPI_TYPE_METHOD) {
 428                                 /*
 429                                  * A method reference "looks" to the parser to be a method
 430                                  * invocation, so we special case it here
 431                                  */
 432                                 arg->common.aml_opcode = AML_INT_NAMEPATH_OP;
 433                                 status =
 434                                     acpi_ds_build_internal_object(walk_state,
 435                                                                   arg,
 436                                                                   &obj_desc->
 437                                                                   package.
 438                                                                   elements[i]);
 439                         } else {
 440                                 /* This package element is already built, just get it */
 441
 442                                 obj_desc->package.elements[i] =
 443                                     ACPI_CAST_PTR(union acpi_operand_object,
 444                                                   arg->common.node);
 445                         }
 446                 } else {
 447                         status = acpi_ds_build_internal_object(walk_state, arg,
 448                                                                &obj_desc->
 449                                                                package.
 450                                                                elements[i]);
 451                 }
 452
 453                 if (*obj_desc_ptr) {
 454
 455                         /* Existing package, get existing reference count */
 456
 457                         reference_count =
 458                             (*obj_desc_ptr)->common.reference_count;
 459                         if (reference_count > 1) {
 460
 461                                 /* Make new element ref count match original ref count */
 462
 463                                 for (index = 0; index < (reference_count - 1);
 464                                      index++) {
 465                                         acpi_ut_add_reference((obj_desc->
 466                                                                package.
 467                                                                elements[i]));
 468                                 }
 469                         }
 470                 }
 471
 472                 arg = arg->common.next;
 473         }
 474
 475         if (!arg) {
 476                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 477                                   "Package List length larger than NumElements count (%X), truncated\n",
 478                                   element_count));
 479         }
 480
 481         obj_desc->package.flags |= AOPOBJ_DATA_VALID;
 482         op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc);
 483         return_ACPI_STATUS(status);
 484 }
 485
 486 /*******************************************************************************
 487  *
 488  * FUNCTION:    acpi_ds_create_node
 489  *
 490  * PARAMETERS:  walk_state      - Current walk state
 491  *              Node            - NS Node to be initialized
 492  *              Op              - Parser object to be translated
 493  *
 494  * RETURN:      Status
 495  *
 496  * DESCRIPTION: Create the object to be associated with a namespace node
 497  *
 498  ******************************************************************************/
 499
 500 acpi_status
 501 acpi_ds_create_node(struct acpi_walk_state *walk_state,
 502                     struct acpi_namespace_node *node,
 503                     union acpi_parse_object *op)
 504 {
 505         acpi_status status;
 506         union acpi_operand_object *obj_desc;
 507
 508         ACPI_FUNCTION_TRACE_PTR(ds_create_node, op);
 509
 510         /*
 511          * Because of the execution pass through the non-control-method
 512          * parts of the table, we can arrive here twice.  Only init
 513          * the named object node the first time through
 514          */
 515         if (acpi_ns_get_attached_object(node)) {
 516                 return_ACPI_STATUS(AE_OK);
 517         }
 518
 519         if (!op->common.value.arg) {
 520
 521                 /* No arguments, there is nothing to do */
 522
 523                 return_ACPI_STATUS(AE_OK);
 524         }
 525
 526         /* Build an internal object for the argument(s) */
 527
 528         status = acpi_ds_build_internal_object(walk_state, op->common.value.arg,
 529                                                &obj_desc);
 530         if (ACPI_FAILURE(status)) {
 531                 return_ACPI_STATUS(status);
 532         }
 533
 534         /* Re-type the object according to its argument */
 535
 536         node->type = ACPI_GET_OBJECT_TYPE(obj_desc);
 537
 538         /* Attach obj to node */
 539
 540         status = acpi_ns_attach_object(node, obj_desc, node->type);
 541
 542         /* Remove local reference to the object */
 543
 544         acpi_ut_remove_reference(obj_desc);
 545         return_ACPI_STATUS(status);
 546 }
 547
 548 #endif                          /* ACPI_NO_METHOD_EXECUTION */
 549
 550 /*******************************************************************************
 551  *
 552  * FUNCTION:    acpi_ds_init_object_from_op
 553  *
 554  * PARAMETERS:  walk_state      - Current walk state
 555  *              Op              - Parser op used to init the internal object
 556  *              Opcode          - AML opcode associated with the object
 557  *              ret_obj_desc    - Namespace object to be initialized
 558  *
 559  * RETURN:      Status
 560  *
 561  * DESCRIPTION: Initialize a namespace object from a parser Op and its
 562  *              associated arguments.  The namespace object is a more compact
 563  *              representation of the Op and its arguments.
 564  *
 565  ******************************************************************************/
 566
 567 acpi_status
 568 acpi_ds_init_object_from_op(struct acpi_walk_state *walk_state,
 569                             union acpi_parse_object *op,
 570                             u16 opcode,
 571                             union acpi_operand_object **ret_obj_desc)
 572 {
 573         const struct acpi_opcode_info *op_info;
 574         union acpi_operand_object *obj_desc;
 575         acpi_status status = AE_OK;
 576
 577         ACPI_FUNCTION_TRACE(ds_init_object_from_op);
 578
 579         obj_desc = *ret_obj_desc;
 580         op_info = acpi_ps_get_opcode_info(opcode);
 581         if (op_info->class == AML_CLASS_UNKNOWN) {
 582
 583                 /* Unknown opcode */
 584
 585                 return_ACPI_STATUS(AE_TYPE);
 586         }
 587
 588         /* Perform per-object initialization */
 589
 590         switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
 591         case ACPI_TYPE_BUFFER:
 592
 593                 /*
 594                  * Defer evaluation of Buffer term_arg operand
 595                  */
 596                 obj_desc->buffer.node =
 597                     ACPI_CAST_PTR(struct acpi_namespace_node,
 598                                   walk_state->operands[0]);
 599                 obj_desc->buffer.aml_start = op->named.data;
 600                 obj_desc->buffer.aml_length = op->named.length;
 601                 break;
 602
 603         case ACPI_TYPE_PACKAGE:
 604
 605                 /*
 606                  * Defer evaluation of Package term_arg operand
 607                  */
 608                 obj_desc->package.node =
 609                     ACPI_CAST_PTR(struct acpi_namespace_node,
 610                                   walk_state->operands[0]);
 611                 obj_desc->package.aml_start = op->named.data;
 612                 obj_desc->package.aml_length = op->named.length;
 613                 break;
 614
 615         case ACPI_TYPE_INTEGER:
 616
 617                 switch (op_info->type) {
 618                 case AML_TYPE_CONSTANT:
 619                         /*
 620                          * Resolve AML Constants here - AND ONLY HERE!
 621                          * All constants are integers.
 622                          * We mark the integer with a flag that indicates that it started
 623                          * life as a constant -- so that stores to constants will perform
 624                          * as expected (noop). zero_op is used as a placeholder for optional
 625                          * target operands.
 626                          */
 627                         obj_desc->common.flags = AOPOBJ_AML_CONSTANT;
 628
 629                         switch (opcode) {
 630                         case AML_ZERO_OP:
 631
 632                                 obj_desc->integer.value = 0;
 633                                 break;
 634
 635                         case AML_ONE_OP:
 636
 637                                 obj_desc->integer.value = 1;
 638                                 break;
 639
 640                         case AML_ONES_OP:
 641
 642                                 obj_desc->integer.value = ACPI_INTEGER_MAX;
 643
 644                                 /* Truncate value if we are executing from a 32-bit ACPI table */
 645
 646 #ifndef ACPI_NO_METHOD_EXECUTION
 647                                 acpi_ex_truncate_for32bit_table(obj_desc);
 648 #endif
 649                                 break;
 650
 651                         case AML_REVISION_OP:
 652
 653                                 obj_desc->integer.value = ACPI_CA_VERSION;
 654                                 break;
 655
 656                         default:
 657
 658                                 ACPI_ERROR((AE_INFO,
 659                                             "Unknown constant opcode %X",
 660                                             opcode));
 661                                 status = AE_AML_OPERAND_TYPE;
 662                                 break;
 663                         }
 664                         break;
 665
 666                 case AML_TYPE_LITERAL:
 667
 668                         obj_desc->integer.value = op->common.value.integer;
 669 #ifndef ACPI_NO_METHOD_EXECUTION
 670                         acpi_ex_truncate_for32bit_table(obj_desc);
 671 #endif
 672                         break;
 673
 674                 default:
 675                         ACPI_ERROR((AE_INFO, "Unknown Integer type %X",
 676                                     op_info->type));
 677                         status = AE_AML_OPERAND_TYPE;
 678                         break;
 679                 }
 680                 break;
 681
 682         case ACPI_TYPE_STRING:
 683
 684                 obj_desc->string.pointer = op->common.value.string;
 685                 obj_desc->string.length =
 686                     (u32) ACPI_STRLEN(op->common.value.string);
 687
 688                 /*
 689                  * The string is contained in the ACPI table, don't ever try
 690                  * to delete it
 691                  */
 692                 obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
 693                 break;
 694
 695         case ACPI_TYPE_METHOD:
 696                 break;
 697
 698         case ACPI_TYPE_LOCAL_REFERENCE:
 699
 700                 switch (op_info->type) {
 701                 case AML_TYPE_LOCAL_VARIABLE:
 702
 703                         /* Split the opcode into a base opcode + offset */
 704
 705                         obj_desc->reference.opcode = AML_LOCAL_OP;
 706                         obj_desc->reference.offset = opcode - AML_LOCAL_OP;
 707
 708 #ifndef ACPI_NO_METHOD_EXECUTION
 709                         status = acpi_ds_method_data_get_node(AML_LOCAL_OP,
 710                                                               obj_desc->
 711                                                               reference.offset,
 712                                                               walk_state,
 713                                                               (struct
 714                                                                acpi_namespace_node
 715                                                                **)&obj_desc->
 716                                                               reference.object);
 717 #endif
 718                         break;
 719
 720                 case AML_TYPE_METHOD_ARGUMENT:
 721
 722                         /* Split the opcode into a base opcode + offset */
 723
 724                         obj_desc->reference.opcode = AML_ARG_OP;
 725                         obj_desc->reference.offset = opcode - AML_ARG_OP;
 726
 727 #ifndef ACPI_NO_METHOD_EXECUTION
 728                         status = acpi_ds_method_data_get_node(AML_ARG_OP,
 729                                                               obj_desc->
 730                                                               reference.offset,
 731                                                               walk_state,
 732                                                               (struct
 733                                                                acpi_namespace_node
 734                                                                **)&obj_desc->
 735                                                               reference.object);
 736 #endif
 737                         break;
 738
 739                 default:        /* Other literals, etc.. */
 740
 741                         if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
 742
 743                                 /* Node was saved in Op */
 744
 745                                 obj_desc->reference.node = op->common.node;
 746                         }
 747
 748                         obj_desc->reference.opcode = opcode;
 749                         break;
 750                 }
 751                 break;
 752
 753         default:
 754
 755                 ACPI_ERROR((AE_INFO, "Unimplemented data type: %X",
 756                             ACPI_GET_OBJECT_TYPE(obj_desc)));
 757
 758                 status = AE_AML_OPERAND_TYPE;
 759                 break;
 760         }
 761
 762         return_ACPI_STATUS(status);
 763 }